/* ==========================================================================
   SAI VISWA CONSTRUCTIONS - HEADER & NAVIGATION STYLES
   ========================================================================== */

/* Top Info Bar */
.topbar {
  background-color: var(--color-navy-950);
  color: var(--color-slate-300);
  font-size: 0.8125rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 1001;
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.topbar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-slate-300);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.topbar-item:hover {
  color: var(--color-cyan-400);
}

.topbar-item svg {
  width: 14px;
  height: 14px;
  color: var(--color-cyan-400);
}

.topbar-tagline {
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-slate-400);
}

/* Main Sticky Header */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
  border-bottom-color: rgba(11, 37, 69, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 1.5rem;
}

/* Brand Logo */
.brand-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo img {
  height: 52px;
  width: auto;
  max-width: 260px;
  object-fit: contain;
  transition: transform var(--transition-fast);
}

.brand-logo:hover img {
  transform: scale(1.02);
}

/* Desktop Navigation Menu */
.main-nav {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

@media (min-width: 1080px) {
  .main-nav {
    display: flex;
  }
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.65rem 0.95rem;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-navy-800);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  letter-spacing: 0.01em;
}

.nav-link svg.dropdown-arrow {
  width: 12px;
  height: 12px;
  stroke-width: 2.5;
  transition: transform var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus,
.nav-item:hover > .nav-link,
.nav-link.active {
  color: var(--color-cyan-600);
  background-color: var(--color-cyan-50);
}

.nav-item:hover > .nav-link svg.dropdown-arrow {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 270px;
  background-color: var(--color-white);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-base);
  pointer-events: none;
  z-index: 100;
}

.dropdown-menu.mega-menu {
  min-width: 320px;
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.dropdown-link {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--border-radius-sm);
  color: var(--color-navy-900);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.dropdown-link:hover {
  background-color: var(--color-cyan-50);
  color: var(--color-cyan-600);
  transform: translateX(4px);
}

.dropdown-icon {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  color: var(--color-cyan-500);
  flex-shrink: 0;
}

.dropdown-title {
  display: block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.875rem;
  line-height: 1.3;
}

.dropdown-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
  font-family: var(--font-body);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-light);
  margin: 0.4rem 0.5rem;
}

/* Header Action Button */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-header-quote {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--color-navy-800) 0%, var(--color-navy-900) 100%);
  color: var(--color-white);
  padding: 0.75rem 1.45rem;
  border-radius: var(--border-radius-sm);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(11, 37, 69, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-header-quote::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-cyan-500);
  transition: transform var(--transition-fast);
  transform: scaleX(0);
}

.btn-header-quote:hover {
  background: var(--color-navy-800);
  color: var(--color-cyan-300);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(11, 37, 69, 0.3);
}

.btn-header-quote:hover::after {
  transform: scaleX(1);
}

/* Mobile Hamburger Toggle */
.mobile-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-sm);
  background: var(--color-slate-100);
  border: 1px solid var(--border-light);
  color: var(--color-navy-900);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-toggle-btn:hover {
  background: var(--color-cyan-50);
  color: var(--color-cyan-600);
}

.mobile-toggle-btn svg {
  width: 22px;
  height: 22px;
}

@media (min-width: 1080px) {
  .mobile-toggle-btn {
    display: none;
  }
}

/* Mobile Slide-Out Drawer Navigation */
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(7, 23, 43, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1998;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 85%;
  max-width: 380px;
  background-color: var(--color-white);
  z-index: 1999;
  display: flex;
  flex-direction: column;
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.25);
  transform: translateX(100%);
  transition: transform var(--transition-smooth);
  overflow-y: auto;
}

.mobile-drawer.open {
  transform: translateX(0);
}

.mobile-drawer-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.mobile-drawer-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-slate-600);
  border-radius: var(--border-radius-sm);
}

.mobile-drawer-close:hover {
  color: var(--color-navy-900);
  background-color: var(--color-slate-100);
}

.mobile-nav-list {
  padding: 1rem 1.5rem;
  flex: 1;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.95rem 0;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-navy-900);
  text-decoration: none;
}

.mobile-nav-link.active,
.mobile-nav-link:hover {
  color: var(--color-cyan-600);
}

.mobile-submenu-toggle {
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-slate-500);
}

.mobile-submenu {
  display: none;
  padding-left: 1rem;
  padding-bottom: 0.75rem;
}

.mobile-submenu.open {
  display: block;
}

.mobile-submenu-link {
  display: block;
  padding: 0.5rem 0;
  font-size: 0.925rem;
  color: var(--color-slate-600);
  text-decoration: none;
}

.mobile-submenu-link:hover {
  color: var(--color-cyan-600);
}

.mobile-drawer-footer {
  padding: 1.5rem;
  background-color: var(--color-slate-50);
  border-top: 1px solid var(--border-light);
}

.mobile-drawer-footer .btn-quote {
  width: 100%;
  text-align: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.mobile-contact-info {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.mobile-contact-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-navy-800);
  text-decoration: none;
  font-weight: 500;
}

.mobile-contact-item svg {
  color: var(--color-cyan-500);
  width: 16px;
  height: 16px;
}